Affine geometry
Triangle centers by Antonio Gutierrez from Geometry Step by Step from the Land of the Incas.
Geometry. Triangle Centers. Antonio Gutierrez
Barycentric coordinates: A Curious Application (solving the "three glasses" problem) at cut-the-knot
Barycentric coordinates, three jugs application
Barycentric Coordinates at cut-the-knot
Barycentric coordinates
Characteristic Property of Centroid at cut-the-knot
A Characteristic Property of Centroid
Trigonometric Form of Ceva's Theorem at cut-the-knot
Trigonometric Form of Ceva's Theorem
Cevian Nest at cut-the-knot
Cevian Nest
Derivations and applications of Ceva's Theorem at cut-the-knot
Ceva's Theorem
Enjoy froola.
Ceva's Theorem, Interactive proof with animation and key concepts by Antonio Gutierrez from the land of the Incas
Ceva's Theorem, Proof using Menelaus - Antonio Gutierrez. Triangle + Concurrent Cevians
Ceva and Menelaus Meet on the Roads cut the knot
Ceva and Menelaus Meet on the Roads
Menelaus From Ceva cut the knot curriculum geometry
Menelaus From Ceva
Alternate proof of Menelaus' theorem, from PlanetMath
PlanetMath: proof of Menelaus' theorem
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It uses material from the Wikipedia articles :
Altitude (triangle) , Barycentric coordinates (mathematics) , Centroid , Ceva's theorem , Menelaus' theorem , .
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the Froola link list about "Affine geometry".